WO2018048284A1 - Procédé d'émission ou de réception de signal dans un système de lan sans fil et dispositif pour cela - Google Patents

Procédé d'émission ou de réception de signal dans un système de lan sans fil et dispositif pour cela Download PDF

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Publication number
WO2018048284A1
WO2018048284A1 PCT/KR2017/009988 KR2017009988W WO2018048284A1 WO 2018048284 A1 WO2018048284 A1 WO 2018048284A1 KR 2017009988 W KR2017009988 W KR 2017009988W WO 2018048284 A1 WO2018048284 A1 WO 2018048284A1
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Prior art keywords
mcs
information
modulation order
spatial streams
spatial
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PCT/KR2017/009988
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English (en)
Korean (ko)
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김진민
조한규
박성진
조경태
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엘지전자 주식회사
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Priority to US16/332,778 priority Critical patent/US10728070B2/en
Priority to EP17849168.4A priority patent/EP3499762B1/fr
Priority to CN202110762940.4A priority patent/CN113595682B/zh
Priority to KR1020197005821A priority patent/KR102130019B1/ko
Priority to CN201780055073.2A priority patent/CN109716687B/zh
Publication of WO2018048284A1 publication Critical patent/WO2018048284A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2603—Signal structure ensuring backward compatibility with legacy system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the following description relates to a method for transmitting and receiving a signal of a station in a WLAN system. More specifically, when a station transmits and receives a signal through a plurality of spatial streams, a Modulation and Coding Scheme applied to each spatial stream. ), And a method for transmitting and receiving a signal based thereon and an apparatus therefor.
  • IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps and IEEE 802.11a provides a transmission rate of 54 Mbps.
  • IEEE 802.11g applies orthogonal frequency-division multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps.
  • IEEE 802.11n applies multiple input multiple output OFDM (MIMO-OFDM) to provide a transmission rate of 300 Mbps for four spatial streams. IEEE 802.11n supports channel bandwidths up to 40 MHz, in this case providing a transmission rate of 600 Mbps.
  • the WLAN standard uses a maximum of 160MHz bandwidth, supports eight spatial streams, and supports IEEE 802.11ax standard through an IEEE 802.11ac standard supporting a speed of up to 1Gbit / s.
  • IEEE 802.11ad defines performance enhancement for ultra-high throughput in the 60 GHz band, and IEEE 802.11ay for channel bonding and MIMO technology is introduced for the first time in the IEEE 802.11ad system.
  • the station can transmit and receive signals through up to eight spatial streams.
  • the station transmitting the signal may indicate the MCS for the maximum eight spatial streams with minimal signaling overhead.
  • the present invention proposes an MCS indication method for each spatial stream and a signal transmission / reception method based on the same.
  • a first station transmits a signal to a second STA through a plurality of spatial streams, wherein the first STA has up to eight spatial streams Modulation order differential information of the MCS for each spatial stream having the same code rate as the reference MCS and the reference MCS and the reference MCS is determined as MCS (Modulation and Coding Scheme) information for the MCS. And transmitting a signal including MCS information for the determined maximum 8 spatial streams to the second STA through the maximum 8 spatial streams.
  • MCS Modulation and Coding Scheme
  • a method in which a first STA receives a signal through a plurality of spatial streams from a second STA in a WLAN system comprising: Modulation and Coding Scheme for up to eight spatial streams 8) a signal including the MCS for each spatial stream having the same code rate as the reference MCS and the modulation order differential information of the reference MCS as information; A signal over a plurality of spatial streams, received from the second STA via streams, and decoding the signal received over the up to eight spatial streams using MCS information for the up to eight spatial streams.
  • the station apparatus has one or more RF (Radio Frequency) chains and a signal with another station apparatus.
  • a transceiver configured to transmit and receive;
  • a processor connected to the transceiver, the processor processing a signal transmitted / received with the other station device, wherein the processor includes: a reference MCS as Modulation and Coding Scheme (MCS) information for up to eight spatial streams;
  • MCS Modulation and Coding Scheme
  • the MCS for each spatial stream having the same code rate as the reference MCS and the modulation order differential information of the reference MCS are determined and MCS information for the determined maximum 8 spatial streams is determined.
  • a station apparatus is proposed, configured to transmit an including signal to the second STA via the at most eight spatial streams.
  • a station apparatus for receiving a signal through a plurality of spatial streams in a WLAN system, the station apparatus comprising: a transceiver having one or more RF (Radio Frequency) chains and configured to transmit and receive a signal with another station apparatus; And a processor connected to the transceiver, the processor processing a signal transmitted / received with the other station device, wherein the processor includes: a reference MCS as Modulation and Coding Scheme (MCS) information for up to eight spatial streams; A second signal through the maximum of eight spatial streams; a signal including MCS for each spatial stream having the same code rate as the reference MCS and modulation order differential information of the reference MCS; A station apparatus is proposed that is configured to decode a signal received from a STA and received over the up to eight spatial streams using MCS information for the up to eight spatial streams.
  • MCS Modulation and Coding Scheme
  • the reference MCS may be set to an MCS having the smallest MCS index among the MCSs for the maximum eight spatial streams.
  • the information on the reference MCS and the MCS information on the up to eight spatial streams may be included in the enhanced directional multi-gigabit (EDMG) header A field in the signal and transmitted.
  • EDMG enhanced directional multi-gigabit
  • the reference MCS may be indicated by a 5-bit field
  • the modulation order difference information of each spatial stream MCS and the reference MCS may be indicated by a 2-bit field.
  • the modulation order difference information between the MCS for each spatial stream and the reference MCS is an MCS for each spatial stream, and has a modulation order that is the same as the reference MCS, has the same code rate as the reference MCS, and has a modulation order that is one larger than the reference MCS.
  • the modulation order difference information having a value of 0 indicates the same MCS as the reference MCS as the MCS for each spatial stream
  • the modulation order difference information having a value of 1 is the same code as the reference MCS as the MCS for each spatial stream.
  • modulation order difference information having a value of 2 is an MCS for each spatial stream and has the same code rate as the reference MCS and is larger than the reference MCS.
  • the modulation order difference information having a value of 3 may indicate an MCS having the same code rate as the reference MCS and a modulation order that is three times larger than the reference MCS as the MCS for each spatial stream.
  • the station according to the present invention can instruct the MCS for each spatial stream with little signaling overhead, and can transmit and receive a signal based thereon.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • FIG. 2 is a diagram illustrating another example of a configuration of a WLAN system.
  • FIG. 3 is a diagram for describing a channel in a 60 GHz band for explaining a channel bonding operation according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a basic method of performing channel bonding in a WLAN system.
  • 5 is a view for explaining the configuration of the beacon interval.
  • FIG. 6 is a diagram for explaining a physical configuration of an existing radio frame.
  • FIG. 7 and 8 are views for explaining the configuration of the header field of the radio frame of FIG.
  • FIG. 10 is a diagram schematically illustrating a PPDU structure applicable to the present invention.
  • FIG. 11 is a flowchart illustrating a signal transmission method of a station applicable to the present invention.
  • FIG. 12 is a view for explaining an apparatus for implementing the method as described above.
  • WLAN system will be described in detail as an example of the mobile communication system.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • the WLAN system includes one or more basic service sets (BSSs).
  • BSS is a set of stations (STAs) that can successfully synchronize and communicate with each other.
  • An STA is a logical entity that includes a medium access control (MAC) and a physical layer interface to a wireless medium.
  • the STA is an access point (AP) and a non-AP STA (Non-AP Station). Include.
  • the portable terminal operated by the user among the STAs is a non-AP STA, and when referred to simply as an STA, it may also refer to a non-AP STA.
  • a non-AP STA may be a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, or a mobile subscriber. It may also be called another name such as a mobile subscriber unit.
  • the AP is an entity that provides an associated station (STA) coupled to the AP to access a distribution system (DS) through a wireless medium.
  • STA station
  • DS distribution system
  • the AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), a personal basic service set central point / access point (PCP / AP), or a site controller.
  • BSS can be divided into infrastructure BSS and Independent BSS (IBSS).
  • IBSS Independent BSS
  • the BBS shown in FIG. 1 is an IBSS.
  • the IBSS means a BSS that does not include an AP. Since the IBSS does not include an AP, access to the DS is not allowed, thereby forming a self-contained network.
  • FIG. 2 is a diagram illustrating another example of a configuration of a WLAN system.
  • the BSS shown in FIG. 2 is an infrastructure BSS.
  • Infrastructure BSS includes one or more STAs and APs.
  • communication between non-AP STAs is performed via an AP.
  • AP access point
  • a plurality of infrastructure BSSs may be interconnected through a DS.
  • a plurality of BSSs connected through a DS is called an extended service set (ESS).
  • STAs included in the ESS may communicate with each other, and a non-AP STA may move from one BSS to another BSS while communicating seamlessly within the same ESS.
  • the DS is a mechanism for connecting a plurality of APs.
  • the DS is not necessarily a network, and there is no limitation on the form if it can provide a predetermined distribution service.
  • the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.
  • FIG. 3 is a diagram for describing a channel in a 60 GHz band for explaining a channel bonding operation according to an embodiment of the present invention.
  • channel 2 of the channels shown in FIG. 3 may be used in all regions and may be used as a default channel.
  • Channels 2 and 3 can be used in most of the designations except Australia, which can be used for channel bonding.
  • a channel used for channel bonding may vary, and the present invention is not limited to a specific channel.
  • FIG. 4 is a diagram illustrating a basic method of performing channel bonding in a WLAN system.
  • FIG. 4 illustrates the operation of 40 MHz channel bonding by combining two 20 MHz channels in an IEEE 802.11n system.
  • 40/80/160 MHz channel bonding will be possible.
  • the two exemplary channels of FIG. 4 include a primary channel and a secondary channel, so that the STA may examine the channel state in a CSMA / CA manner for the primary channel of the two channels. If the secondary channel is idle for a predetermined time (e.g. PIFS) at the time when the primary channel idles for a constant backoff interval and the backoff count becomes zero, the STA is assigned to the primary channel and Auxiliary channels can be combined to transmit data.
  • PIFS a predetermined time
  • channel bonding when channel bonding is performed based on contention as illustrated in FIG. 4, channel bonding may be performed only when the auxiliary channel is idle for a predetermined time at the time when the backoff count for the primary channel expires. Therefore, the use of channel bonding is very limited, and it is difficult to flexibly respond to the media situation.
  • an aspect of the present invention proposes a method in which an AP transmits scheduling information to STAs to perform access on a scheduling basis. Meanwhile, another aspect of the present invention proposes a method of performing channel access based on the above-described scheduling or on a contention-based basis independently of the above-described scheduling. In addition, another aspect of the present invention proposes a method for performing communication through a spatial sharing technique based on beamforming.
  • 5 is a view for explaining the configuration of the beacon interval.
  • the time of the medium may be divided into beacon intervals. Lower periods within the beacon interval may be referred to as an access period. Different connection intervals within one beacon interval may have different access rules.
  • the information about the access interval may be transmitted to the non-AP STA or the non-PCP by an AP or a personal basic service set control point (PCP).
  • PCP personal basic service set control point
  • one beacon interval may include one beacon header interval (BHI) and one data transfer interval (DTI).
  • BHI may include a Beacon Transmission Interval (BTI), an Association Beamforming Training (A-BFT), and an Announcement Transmission Interval (ATI).
  • BTI Beacon Transmission Interval
  • A-BFT Association Beamforming Training
  • ATI Announcement Transmission Interval
  • the BTI means a section in which one or more DMG beacon frames can be transmitted.
  • A-BFT refers to a section in which beamforming training is performed by an STA that transmits a DMG beacon frame during a preceding BTI.
  • ATI means a request-response based management access interval between PCP / AP and non-PCP / non-AP STA.
  • one or more Content Based Access Period (CBAP) and one or more Service Periods (SPs) may be allocated as data transfer intervals (DTIs).
  • CBAP Content Based Access Period
  • SPs Service Periods
  • DTIs data transfer intervals
  • PHY MCS Note Control PHY 0 Single carrier PHY (SC PHY) 1 ... 1225 ... 31 (low power SC PHY) OFDM PHY 13 ... 24
  • modulation modes can be used to meet different requirements (eg, high throughput or stability). Depending on your system, only some of these modes may be supported.
  • FIG. 6 is a diagram for explaining a physical configuration of an existing radio frame.
  • DMG Directional Multi-Gigabit
  • the preamble of the radio frame may include a Short Training Field (STF) and a Channel Estimation (CE).
  • the radio frame may include a data field as a header and a payload, and optionally a training field for beamforming.
  • FIG. 7 and 8 are views for explaining the configuration of the header field of the radio frame of FIG.
  • FIG. 7 illustrates a case in which a single carrier (SC) mode is used.
  • SC single carrier
  • a header indicates information indicating an initial value of scrambling, a modulation and coding scheme (MCS), information indicating a length of data, and additional information.
  • MCS modulation and coding scheme
  • PPDU physical protocol data unit
  • packet type packet type
  • training length aggregation
  • beam training (or tracking) request last RSSI (received signal strength indicator)
  • truncation header Check sequence
  • the header has 4 bits of reserved bits, which may be used in the following description.
  • the OFDM header includes information indicating the initial value of scrambling, MCS, information indicating the length of data, information indicating the presence or absence of additional PPDUs, packet type, training length, whether to aggregate, whether to request beam training (or tracking), whether the last RSSI, It may include information such as whether to disconnect or a header check sequence (HCS).
  • HCS header check sequence
  • the header has 2 bits of reserved bits, and in the following description, such reserved bits may be utilized as in the case of FIG.
  • the IEEE 802.11ay system is considering introducing channel bonding and MIMO technology for the first time in the existing 11ad system.
  • a new PPDU structure is needed. That is, the existing 11ad PPDU structure has limitations in supporting legacy terminals and implementing channel bonding and MIMO.
  • a new field for the 11ay terminal may be defined after the legacy preamble and the legacy header field for supporting the legacy terminal.
  • channel bonding and MIMO may be supported through the newly defined field.
  • FIG. 9 illustrates a PPDU structure according to one preferred embodiment of the present invention.
  • the horizontal axis may correspond to the time domain and the vertical axis may correspond to the frequency domain.
  • a frequency band (eg, 400 MHz band) of a predetermined size may exist between frequency bands (eg, 1.83 GHz) used in each channel.
  • legacy preambles legacy STFs, legacy CEs
  • a new STF and CE are simultaneously transmitted together with the legacy preambles through a 400 MHz band between each channel. Gap filling may be considered.
  • the PPDU structure according to the present invention transmits ay STF, ay CE, ay header B, and payload in a broadband manner after legacy preamble, legacy header, and ay header A.
  • ay header, ay Payload field, and the like transmitted after the header field may be transmitted through channels used for bonding.
  • the ay header may be referred to as an enhanced directional multi-gigabit (EDMG) header to distinguish the ay header from the legacy header, and the name may be used interchangeably.
  • EDMG enhanced directional multi-gigabit
  • a total of six or eight channels may exist in 11ay, and a single STA may bond and transmit up to four channels.
  • the ay header and ay Payload may be transmitted through 2.16 GHz, 4.32 GHz, 6.48 GHz, 8.64 GHz bandwidth.
  • the PPDU format when repeatedly transmitting the legacy preamble without performing the gap-filling as described above may also be considered.
  • ay STF, ay CE, and ay header B are replaced by a wide band after legacy preamble, legacy header, and ay header A without performing the gap-filling. It has a form of transmission.
  • FIG. 10 is a diagram schematically illustrating a PPDU structure applicable to the present invention. Briefly summarizing the above-described PPDU format can be represented as shown in FIG.
  • the PPDU format applicable to the 11ay system includes L-STF, L-CE, L-Header, EDMG-Header-A, EDMG-STF, EDMG-CEF, EDMG-Header-B, Data, It may include a TRN field, which may be selectively included according to the type of the PPDU (eg, SU PPDU, MU PPDU, etc.).
  • a portion including the L-STF, L-CE, and L-header fields may be referred to as a non-EDMG portion, and the remaining portion may be referred to as an EDMG region.
  • the L-STF, L-CE, L-Header, and EDMG-Header-A fields may be called pre-EDMG modulated fields, and the rest may be called EDMG modulated fields.
  • MCS Modulation and Coding Schemes
  • SC Single Carrier
  • OFDM Orthogonal Frequency Division Multiplexing
  • Table 2 shows the MCS configuration of the SC mode
  • Table 3 shows the MCS configuration of the OFDM mode.
  • N CB represents a value of 1 to 4 as the number of bonded channels
  • N SS represents the total number of spatial streams
  • N CBPS represents the number of coding bits per symbol.
  • an MCS modulation method different from the MCS indicated by the table may be applied according to the value of the 'Non-Uniform Constellation (NUC) Applied' field of the EDMG Header-A field.
  • NUC 'Non-Uniform Constellation
  • the configuration may be set to apply 8PSK instead of 16QAM as the MCS.
  • 8PSK which is higher than 16QAM, throughput can be compensated (or overcome) by a code rate.
  • the STA may indicate a specific MCS using a 5-bit indicator.
  • the present invention proposes a method of indicating an MCS applied to each of up to eight spatial streams using information having a bit size smaller than 40 bits.
  • the reference MCS may be indicated by 5 bits of information.
  • the MCS information for the X-th (1 ⁇ X ⁇ 8) spatial stream may be indicated by information of N bit size. In this case, information indicating a total of 5 + 8 * N bits is needed to indicate an MCS applied to up to eight spatial streams.
  • the reference MCS corresponds to the lowest MCS index, the highest MCS index, the most frequent MCS index, the lowest MCS index and the highest among the MCSs applied to the plurality of spatial streams. It may correspond to an intermediate index of the MCS index.
  • N 2 and the reference MCS corresponds to the lowest MCS index among MCSs applied to the plurality of spatial streams
  • N bit information of each spatial stream indicates one of four MCS indexes as follows. can do.
  • the N bit information when N bit information of a specific spatial stream is 0 ('00'), the N bit information may mean the same MCS index as the reference MCS.
  • the N bit information When the N bit information is 1 ('01'), the N bit information may mean an MCS index that is M larger than the reference MCS.
  • the N bit information When the N bit information is 2 ('10'), the N bit information may mean an MCS index that is 2 * M larger than the reference MCS.
  • the N bit information When the N bit information is 3 ('11'), the N bit information may mean an MCS index that is 3 * M larger than the reference MCS.
  • N bit information for each spatial stream may be defined in the opposite manner to the above.
  • N bit information for each spatial stream may be interpreted as follows. Can be.
  • the N bit information may mean the same MCS index as the reference MCS.
  • the N bit information may mean an MCS index smaller by M than the reference MCS.
  • the N bit information may mean an MCS index that is M larger than the reference MCS.
  • the N bit information is 3 ('11'), the N bit information may mean an MCS index that is 2 * M larger than the reference MCS.
  • the present invention proposes a method of indicating an MCS index in which the same code rate as that of the reference MCS is applied using the N bit information and the modulation order is the same / different.
  • 1/2 code rate MCS as the MCS having the lowest MCS index among MCSs applied to the plurality of spatial streams
  • 0 (' N bit information having a value of 00 ') means an MCS corresponding to the same modulation order and code rate as the reference MCS
  • N bit information having a value of 1 (' 01 ') is 1/2 code equal to the reference MCS.
  • MCS corresponding to ⁇ / 2 QPSK (Quadrature Phase Shift Keying) having a rate and having a modulation order of 1 larger than that of the reference MCS.
  • N bit information having a value of 2 means an MCS corresponding to 16 QAM (Quadrature Amplitude Modulation) having a 1/2 code rate equal to the reference MCS and having a modulation order two greater than that of the reference MCS.
  • N-bit information having a value of 3 may mean an MCS corresponding to 64 QAMs having a 1/2 code rate equal to the reference MCS and having a modulation order 3 greater than that of the reference MCS.
  • an MCS for each channel combined channel must be indicated in order to reliably receive the signal or frame.
  • the transmitted EDMG Header-A field may require a total of 2 * (5 + 8 * N) bit sizes to indicate the MCS for each combined channel. Can be.
  • each combined channel is transmitted through (5 + 8 * N) bit size information of the EDMG Header-A field as in the case of non-channel combining transmission.
  • MCS may be indicated.
  • some bits of the (5 + 8 * N) bit size information may be used to indicate MCS information for a combined channel that does not include a primary channel.
  • 5 bit size information among (5 + 8 * N) bit size information included in the EDMG Header-A field is used to indicate a reference MCS
  • 4 N bit size information among 8 N bit size information is mainly used. It is used to indicate the MCS for the spatial stream of the combined channel including the channel, and the remaining four N bit size information can be used to indicate the MCS for the spatial stream of the combined channel not including the main channel.
  • the number of spatial streams for each combined channel among the total eight spatial streams when the number of spatial streams for each combined channel among the total eight spatial streams is defined, it may be defined how many N bit size information among the eight N bit size information corresponds to each combined channel. Can be. As a specific example, when the number of spatial streams of the combined channel including the main channel is three and the number of spatial streams of the combined channel including the main channel is five, three N bit size information among the eight N bit size information. Is used to indicate the MCS for the spatial stream of the combined channel including the primary channel and the remaining five N bit size information can be used to indicate the MCS for the spatial stream of the combined channel not including the primary channel.
  • the reference MCS for each combined channel may be separately set. That is, the 5 bit size information of the 10 bit size information may indicate the reference MCS for the combined channel including the primary channel, and the remaining 5 bit size information may indicate the reference MCS for the combined channel not including the primary channel. have. Subsequently, eight N bit size information may be divided according to the number of spatial streams of each combined channel and used to indicate the MCS for the spatial stream of the corresponding combined channel. In this case, bit information indicating the MCS may be defined as a total of 10 + 8 * N bit sizes.
  • four spatial streams of up to eight spatial streams independently indicate a corresponding MCS, and the remaining MCS (differential MCS) for the remaining spatial stream (s) Suggest ways to direct.
  • independent MCS information may be indicated (or set) for four spatial streams using 20 (ie, 4 * 5) bit size information.
  • each 5-bit size information may indicate one of all MCS indexes of Table 2 without restriction.
  • each 5-bit size information may indicate one MCS index among MCS indexes having the same code rate.
  • the MCS information for the remaining up to four spatial stream (s) may be indicated as a difference value for independent indication (or independent MCS information) for the four spatial streams described above.
  • D when the number of differential steps is referred to as D, using the minimum m bit size information satisfying 2 m ⁇ D + 1 corresponds to all cases (including when indicating the same MCS index). MCS information may be indicated. In this case, a total of 20+ (5 * m) bit size information may be required to indicate MCS information for up to eight spatial streams.
  • the differential size of one difference step may be set to p. Accordingly, when one step is indicated as the difference value, it may mean that the MCS applied to the corresponding spatial stream is an index that is ⁇ p different from the reference MCS index. Alternatively, p may mean a difference value of a modulation order rather than a difference value of an MCS index.
  • the MCS index for the first spatial stream may be set as the reference MCS.
  • the MCS for the 1 st to 4 th spatial streams is indicated by independent bit information
  • the MCS index for the remaining 5 to 8 th spatial streams indicates a difference value from the MCS index for the 1 st spatial stream.
  • the MCS for the specific spatial stream is the same as the MCS for the first spatial stream. It may mean.
  • the MCS for the specific spatial stream may mean an MCS that differs by + p compared to the MCS index for the first spatial stream.
  • the MCS for the specific spatial stream may mean an MCS that differs by + 2p from the MCS index for the first spatial stream.
  • the MCS for the specific spatial stream may mean an MCS that is -p different from the MCS index for the first spatial stream.
  • all of the MCS indexes for the first to fourth spatial streams may be set as the reference MCS.
  • MCSs for the 1 st through 4 th spatial streams are indicated by independent bit information, and MCS indexes for the remaining 5 th through 8 th spatial streams are different from MCS indexes for the 1 th through 4 th spatial streams.
  • Each may be indicated by bit information indicating.
  • the MCS index for the fifth spatial stream is indicated by the first bit information indicating how much difference is based on the MCS index for the first spatial stream
  • the MCS index for the sixth spatial stream is 2 It may be indicated by the second bit information indicating how much difference based on the MCS index for the first spatial stream.
  • the MCS index for the seventh spatial stream is indicated by the third bit information indicating how much difference is based on the MCS index for the third spatial stream
  • the MCS index for the eighth spatial stream is the fourth. It may be indicated by the fourth bit information indicating how much difference based on the MCS index for the spatial stream.
  • the smallest or smallest MCS index among the MCS indexes for the 1 st to 4 th spatial streams may be set as the reference MCS.
  • MCSs for the 1 st through 4 th spatial streams may be indicated by independent bit information, and a lowest or highest MCS index value among the MCS indexes for the 4 spatial streams may be set as a reference MCS. . Subsequently, the MCS indexes for the 5th to 8th spatial streams may be set by indicating a difference value from the reference MCS index.
  • the separate 2-bit size information may indicate whether one of the MCS indexes for the 1-4th spatial stream is set as the reference MCS index for the 5-8th spatial streams. have.
  • reference MCS information may be indicated through separate bit information. That is, the separate 5-bit size information may indicate the reference MCS index for the fifth to eighth spatial streams.
  • independent MCS indexes may be used to indicate the MCS of the primary channel
  • differential MCS indexes may be used to indicate the MCS of the secondary channel.
  • half of the independent MCS index and half of the differential MCS indexes may be used to indicate the MCS of the primary channel, and the other half of the independent MCS index and the other half of the differential MCS indexes may be used to indicate the MCS of the secondary channel.
  • FIG. 11 is a flowchart illustrating a signal transmission method of a station applicable to the present invention.
  • a station according to the present invention may perform steps S1110 and S1120 to transmit a signal through a plurality of spatial streams.
  • the station determines MCS information for up to eight spatial streams (S1110).
  • the MCS information of the maximum eight spatial streams includes a reference MCS, MCS for each spatial stream having the same code rate as the reference MCS, and modulation order difference information of the reference MCS.
  • the number of applicable spatial streams may be 1 to 8, preferably 5 to 8 may be applied.
  • the station may set the MCS having the smallest MCS index among the MCSs for the maximum 8 spatial streams as a reference MCS.
  • the reference MCS is set to an MCS whose modulation order corresponding to MCS index '4' in Table 2 is? / 2-BPSK and the code rate is 3/4.
  • the station determines modulation order difference information of up to eight spatial streams based on the reference MCS and the reference MCS.
  • the modulation order difference information for each spatial stream is set to a value. Therefore, the following information can be indicated.
  • MCS having the same code rate as the reference MCS and having a modulation order one greater than the reference MCS. That is, in the above example, the MCS whose modulation order corresponds to MCS '9' is ⁇ / 2-QPSK and the code rate is 3/4.
  • MCS having the same code rate as the reference MCS and having a modulation order two orders of magnitude greater than the reference MCS. That is, in the above example, the MCS having a modulation order ⁇ / 2-16QAM corresponding to MCS '14' and a code rate of 3/4
  • MCS having the same code rate as the reference MCS and having a modulation order three greater than the reference MCS. That is, in the above example, the modulation order corresponding to MCS '18' is ⁇ / 2-64QAM and the code rate is 3/4
  • the station transmits a signal including the MCS information for the up to eight spatial streams to the second STA through the up to eight spatial streams (S1120).
  • MCS information on the maximum eight spatial streams may be transmitted through the EDMG Header-A field in the signal.
  • the reference MCS may be indicated by 5 bits of information
  • the modulation order difference information between the MCS of each spatial stream and the reference MCS may be indicated by 2 bits of information.
  • signaling overhead for indicating MCS information for each spatial stream can be reduced.
  • a station receiving a signal includes a reference MCS and MCS for each spatial stream having the same code rate as the reference MCS as MCS (Modulation and Coding Scheme) information for up to eight spatial streams.
  • MCS Modulation and Coding Scheme
  • Receiving a signal including modulation order differential information of a reference MCS through the up to 8 spatial streams, and using the MCS information for the up to 8 spatial streams the up to 8 spatial streams Can decode the received signal.
  • FIG. 12 is a view for explaining an apparatus for implementing the method as described above.
  • the wireless device 100 of FIG. 12 is a station that transmits signals through a plurality of spatial streams described in the above description, and the wireless device 150 is connected to a station that receives signals through a plurality of spatial streams described in the above description. It can respond.
  • each station may correspond to an 11ay terminal or a PCP / AP.
  • a station transmitting a signal is called a transmitting device 100, and a station receiving a signal is called a receiving device 150.
  • the transmitter 100 may include a processor 110, a memory 120, and a transceiver 130
  • the receiver device 150 may include a processor 160, a memory 170, and a transceiver 180. can do.
  • the transceiver 130 and 180 may transmit / receive a radio signal and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
  • the processors 110 and 160 are executed in the physical layer and / or the MAC layer and are connected to the transceivers 130 and 180.
  • the processors 110 and 160 and / or the transceivers 130 and 180 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processors.
  • the memory 120, 170 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage unit.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory card
  • storage medium storage medium and / or other storage unit.
  • the method described above can be executed as a module (eg, process, function) that performs the functions described above.
  • the module may be stored in the memories 120 and 170 and may be executed by the processors 110 and 160.
  • the memories 120 and 170 may be disposed inside or outside the processes 110 and 160, and may be connected to the processes 110 and 160 by well-known means.
  • the present invention has been described assuming that it is applied to an IEEE 802.11-based WLAN system, but the present invention is not limited thereto.
  • the present invention can be applied in the same manner to various wireless systems capable of data transmission based on channel bonding.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'émission ou de réception d'un signal par une station dans un système de LAN sans fil (WLAN) et, en particulier, elle concerne un procédé dans lequel, lorsqu'une station émet ou reçoit un signal par l'intermédiaire d'une pluralité de flux spatiaux dans un système de LAN sans fil, la station utilise un schéma de modulation et de codage (MCS) appliqué à chaque flux spatial, un procédé d'émission ou de réception d'un signal basé sur celui-ci, et un dispositif associé.
PCT/KR2017/009988 2016-09-12 2017-09-12 Procédé d'émission ou de réception de signal dans un système de lan sans fil et dispositif pour cela WO2018048284A1 (fr)

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US16/332,778 US10728070B2 (en) 2016-09-12 2017-09-12 Method for transmitting or receiving signal in wireless LAN system and device therefor
EP17849168.4A EP3499762B1 (fr) 2016-09-12 2017-09-12 Procédé d'émission ou de réception de signal dans un système de lan sans fil et dispositif pour cela
CN202110762940.4A CN113595682B (zh) 2016-09-12 2017-09-12 在无线lan系统中发送或接收信号的方法及其设备
KR1020197005821A KR102130019B1 (ko) 2016-09-12 2017-09-12 무선랜 시스템에서의 신호 송수신 방법 및 이를 위한 장치
CN201780055073.2A CN109716687B (zh) 2016-09-12 2017-09-12 在无线lan系统中发送或接收信号的方法及其设备

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US62/412,285 2016-10-25

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CN109716687A (zh) 2019-05-03
CN113595682A (zh) 2021-11-02
EP3499762B1 (fr) 2020-11-04
EP3499762A1 (fr) 2019-06-19
KR20190029736A (ko) 2019-03-20
KR102130019B1 (ko) 2020-07-03
US10728070B2 (en) 2020-07-28

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